Add some known subtype issue to the test file.

[N5N3]

It looks harmless to add them to test as we have fixed two of them by accident.
close #38497
close #33138

[vtjnash]

LGTM

[ulysses4ever]

Why does it say “close #33138” but only adds a test for #33137? From my experiments, both of those are fixed now (miraculously), so, from here:

• close Subtyping bug: equivalent types behave differently when matching with diagonal variables #33137 too
• possibly, add a test for Subtyping bug: incorrect interaction between variables with degenerate bounds and diagonal rule #33138

[ulysses4ever]

(Of course, I messed up the numbers too, fixed now)

[DilumAluthge]

Is there any chance that this would cause CI to hang when running with assertions? E.g. https://buildkite.com/julialang/julia-buildkite-scheduled/builds/325#01839d90-e44a-43a6-bb7d-ed31dcb2bd39

(rr trace is available)

[N5N3]

@DilumAluthge Some of the added tests throw stack overflow on master. So it might be related.